// Copyright 2004-2008 Castle Project - http://www.castleproject.org/
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//     http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Castle.MicroKernel.Proxy
{
	using System;
	using System.Runtime.Remoting;
	using Castle.Core;
	using Castle.Core.Interceptor;

	/// <summary>
	/// Helper support for proxy configuration.
	/// </summary>
	public abstract class ProxyUtil
	{
		/// <summary>
		/// Obtains the <see cref="ProxyOptions"/> associated with the <see cref="ComponentModel"/>.
		/// </summary>
		/// <param name="model">The component model.</param>
		/// <param name="createOnDemand">true if the options should be created if not present.</param>
		/// <returns>The associated proxy options for the component model.</returns>
		public static ProxyOptions ObtainProxyOptions(ComponentModel model, bool createOnDemand)
		{
			ProxyOptions options = model.ExtendedProperties[ProxyConstants.ProxyOptionsKey] as ProxyOptions;

			if (options == null && createOnDemand)
			{
				options = new ProxyOptions();
				model.ExtendedProperties[ProxyConstants.ProxyOptionsKey] = options;
			}

			return options;
		}

		public static object GetUnproxiedInstance(object instance)
		{
			if (!RemotingServices.IsTransparentProxy(instance))
			{
				IProxyTargetAccessor accessor = instance as IProxyTargetAccessor;

				if (accessor != null)
				{
					instance = accessor.DynProxyGetTarget();
				}
			}

			return instance;
		}

		public static Type GetUnproxiedType(object instance)
		{
			if (!RemotingServices.IsTransparentProxy(instance))
			{
				IProxyTargetAccessor accessor = instance as IProxyTargetAccessor;

				if (accessor != null)
				{
					object target = accessor.DynProxyGetTarget();

					if (target != null)
					{
						if (ReferenceEquals(target, instance))
						{
							return instance.GetType().BaseType;
						}

						instance = target;
					}
				}
			}

			return instance.GetType();
		}
	}
}